突然之间，我们的服务器开始变得非常奇怪，CPU使用率非常高，RAM使用率也很低。 我从来没有见过这个，我不知道该怎么做。 我觉得如果我能让系统开始使用更多的可用内存，CPU使用率会更低，但我似乎无法调整它来做到这一点。 这是使用PubNub的一个WordPress单一网站w / CometChat。 CPU的扣球几个星期前开始，有时它的平均负载是10有时是40 + …我似乎没有能够追查原因。 我应该有足够的资源来处理我们收到的stream量。 8个2.4Ghz内核和24GB内存！
我会很感激任何人可以提供帮助。 这是一些相关的数据…（我最近试图平息事情）
user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 4096; multi_accept on; accept_mutex_delay 50ms; } http { ## # Basic Settings ## sendfile on; #tcp_nopush on; #tcp_nodelay on; keepalive_timeout 5; keepalive_requests 100000; reset_timedout_connection on; types_hash_max_size 2048; server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/nginx/mime.types; default_type application/octet-stream; ## # Logging Settings ## access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; ## # File Cache Settings ## open_file_cache max=20000 inactive=20s; open_file_cache_valid 30s; open_file_cache_min_uses 2; open_file_cache_errors on; ## # Gzip Settings ## gzip on; gzip_static on; gzip_disable "msie6"; gzip_vary on; gzip_proxied any; gzip_comp_level 6; gzip_buffers 16 8k; gzip_http_version 1.1; gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript; index index.php index.htm index.html redirect.php; upstream php { server 127.0.0.1:9000; } ## # Virtual Host Configs ## include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] key_buffer = 512M sort_buffer_size = 8M read_buffer_size = 8M read_rnd_buffer_size = 8M myisam_sort_buffer_size = 256M query_cache_size = 512M innodb_buffer_pool_size = 512M # # * Basic Settings # user = mysql socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. bind-address = 127.0.0.1 # # * Fine Tuning # max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 256 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP max_connections = 400 wait_timeout = 250 interactive_timeout = 250 join_buffer_size = 8M tmp_table_size = 512M max_heap_table_size = 512M table_cache = 2048 # # * Query Cache Configuration # query_cache_limit = 4M #query_cache_size = 16M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. # As of 5.1 you can enable the log at runtime! #general_log_file = /var/log/mysql/mysql.log #general_log = 1 log_error = /var/log/mysql/error.log # Here you can see queries with especially long duration slow_query_log = 1 slow_query_log_file = /var/log/mysql/mysql-slow.log long_query_time = 2 # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M [mysqldump] quick quote-names max_allowed_packet = 16M
pm = dynamic pm.max_children = 40 pm.start_servers = 20 pm.min_spare_servers = 10 pm.max_spare_servers = 40 pm.max_requests = 50000
[04-Jan-2013 12:08:59] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 8 children, there are 0 idle, and 27 total children [04-Jan-2013 12:09:00] WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 16 children, there are 0 idle, and 35 total children [04-Jan-2013 12:09:01] WARNING: [pool www] server reached pm.max_children setting (40), consider raising it
但如果我提高max_children，它只会增加CPU的负载。
total used free shared buffers cached Mem: 24184356 8739828 15444528 0 239376 4526028 -/+ buffers/cache: 3974424 20209932 Swap: 1048572 0 1048572
1 [||||||||||||||||||||||||||||||100.0%] Tasks: 86, 279 thr; 43 running 2 [||||||||||||||||||||||||||||||100.0%] Load average: 36.83 37.80 40.27 3 [||||||||||||||||||||||||||||||100.0%] Uptime: 1 day, 13:55:16 4 [||||||||||||||||||||||||||||||100.0%] 5 [||||||||||||||||||||||||||||||100.0%] 6 [||||||||||||||||||||||||||||||100.0%] 7 [||||||||||||||||||||||||||||||100.0%] 8 [||||||||||||||||||||||||||||||100.0%] Mem[|||||||||||||| 3806/23617MB] Swp[ 0/1023MB] PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command 635 mysql 20 0 5867M 661M 8520 S 120. 2.8 22h27:59 /usr/sbin/mysqld 32522 www-data 20 0 342M 86872 37908 R 23.0 0.4 2:40.74 php-fpm: pool www 32510 www-data 20 0 388M 131M 38572 R 20.0 0.6 2:49.39 php-fpm: pool www 32508 www-data 20 0 361M 104M 38432 R 19.0 0.4 2:42.97 php-fpm: pool www 32521 www-data 20 0 326M 69972 38784 R 18.0 0.3 2:35.50 php-fpm: pool www 32516 www-data 20 0 386M 129M 38552 R 16.0 0.5 2:45.58 php-fpm: pool www 32529 www-data 20 0 389M 131M 37916 R 16.0 0.6 2:42.09 php-fpm: pool www 32504 www-data 20 0 370M 113M 38596 R 16.0 0.5 2:42.96 php-fpm: pool www 32526 www-data 20 0 365M 108M 38552 R 15.0 0.5 2:42.65 php-fpm: pool www 32507 www-data 20 0 360M 102M 37912 R 15.0 0.4 2:25.33 php-fpm: pool www 32520 www-data 20 0 357M 101M 38540 R 15.0 0.4 2:43.34 php-fpm: pool www 32523 www-data 20 0 361M 104M 38548 R 15.0 0.4 2:37.45 php-fpm: pool www 32535 www-data 20 0 363M 106M 38552 R 15.0 0.4 2:49.62 php-fpm: pool www 32530 www-data 20 0 342M 87856 38584 R 15.0 0.4 2:38.24 php-fpm: pool www 32533 www-data 20 0 341M 86592 37604 R 15.0 0.4 2:52.92 php-fpm: pool www 32511 www-data 20 0 371M 114M 38608 R 14.0 0.5 2:44.71 php-fpm: pool www 32512 www-data 20 0 364M 106M 38416 R 14.0 0.5 2:39.31 php-fpm: pool www 32514 www-data 20 0 349M 94528 38564 R 14.0 0.4 2:39.62 php-fpm: pool www 32513 www-data 20 0 360M 103M 37820 R 14.0 0.4 2:43.11 php-fpm: pool www 32528 www-data 20 0 380M 123M 38596 R 14.0 0.5 2:40.09 php-fpm: pool www 32505 www-data 20 0 362M 105M 38540 R 14.0 0.4 2:47.40 php-fpm: pool www 32524 www-data 20 0 344M 89840 38552 R 14.0 0.4 2:43.62 php-fpm: pool www 32509 www-data 20 0 359M 102M 38568 R 14.0 0.4 2:48.95 php-fpm: pool www 32537 www-data 20 0 369M 112M 38588 R 13.0 0.5 2:43.47 php-fpm: pool www 32501 www-data 20 0 363M 105M 38436 R 13.0 0.4 2:41.65 php-fpm: pool www 32498 www-data 20 0 342M 88104 38580 R 13.0 0.4 2:40.12 php-fpm: pool www 32506 www-data 20 0 384M 126M 37816 R 13.0 0.5 2:43.70 php-fpm: pool www 32536 www-data 20 0 337M 82956 38584 R 13.0 0.3 2:33.11 php-fpm: pool www 32527 www-data 20 0 380M 122M 37536 R 13.0 0.5 2:37.99 php-fpm: pool www 32538 www-data 20 0 364M 107M 38588 R 13.0 0.5 2:36.25 php-fpm: pool www 32515 www-data 20 0 370M 113M 37920 R 12.0 0.5 2:38.53 php-fpm: pool www 32496 www-data 20 0 346M 92484 38656 R 12.0 0.4 2:37.37 php-fpm: pool www 32531 www-data 20 0 361M 103M 38460 R 12.0 0.4 2:45.09 php-fpm: pool www 32532 www-data 20 0 356M 99M 38544 R 11.0 0.4 2:47.93 php-fpm: pool www 17645 mysql 20 0 5867M 661M 8520 S 6.0 2.8 7:32.69 /usr/sbin/mysqld 32525 www-data 20 0 349M 95344 38572 R 6.0 0.4 2:39.90 php-fpm: pool www 30993 root 20 0 26096 2480 1404 R 5.0 0.0 5:26.88 htop 12612 mysql 20 0 5867M 661M 8520 S 5.0 2.8 15:11.08 /usr/sbin/mysqld 30744 mysql 20 0 5867M 661M 8520 R 5.0 2.8 0:07.03 /usr/sbin/mysqld 30371 mysql 20 0 5867M 661M 8520 S 5.0 2.8 0:09.67 /usr/sbin/mysqld 30336 mysql 20 0 5867M 661M 8520 S 5.0 2.8 0:07.02 /usr/sbin/mysqld 27169 mysql 20 0 5867M 661M 8520 R 4.0 2.8 10:58.63 /usr/sbin/mysqld 12121 mysql 20 0 5867M 661M 8520 S 4.0 2.8 8:13.50 /usr/sbin/mysqld 30471 mysql 20 0 5867M 661M 8520 S 4.0 2.8 0:08.43 /usr/sbin/mysqld 30723 mysql 20 0 5867M 661M 8520 S 4.0 2.8 0:07.12 /usr/sbin/mysqld 30314 mysql 20 0 5867M 661M 8520 S 4.0 2.8 0:09.48 /usr/sbin/mysqld 30462 mysql 20 0 5867M 661M 8520 R 4.0 2.8 0:08.27 /usr/sbin/mysqld 30752 mysql 20 0 5867M 661M 8520 S 4.0 2.8 0:06.71 /usr/sbin/mysqld 1371 mysql 20 0 5867M 661M 8520 S 4.0 2.8 17:29.79 /usr/sbin/mysql
>> MySQLTuner 1.2.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.5.28-0ubuntu0.12.04.3-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 27M (Tables: 40) [--] Data in InnoDB tables: 55M (Tables: 61) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 61 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 13h 56m 26s (278M q [2K qps], 610K conn, TX: 643B, RX: 22B) [--] Reads / Writes: 99% / 1% [--] Total buffers: 2.0G global + 32.2M per thread (400 max threads) [OK] Maximum possible memory usage: 14.6G (63% of installed RAM) [OK] Slow queries: 0% (92/278M) [OK] Highest usage of available connections: 72% (289/400) [OK] Key buffer size / total MyISAM indexes: 512.0M/16.3M [OK] Key buffer hit rate: 100.0% (9M cached / 2K reads) [!!] Query cache efficiency: 0.0% (64K cached / 275M selects) [OK] Query cache prunes per day: 0 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 757K sorts) [OK] Temporary tables created on disk: 19% (233K on disk / 1M total) [OK] Thread cache hit rate: 99% (289 created / 610K connections) [!!] Table cache hit rate: 18% (364 open / 1K opened) [OK] Open file limit used: 4% (194/4K) [OK] Table locks acquired immediately: 99% (276M immediate / 276M locks) [OK] InnoDB data size / buffer pool: 55.9M/512.0M -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Increase table_cache gradually to avoid file descriptor limits Variables to adjust: query_cache_limit (> 4M, or use smaller result sets) table_cache (> 2048)
SLOW QUERIES The slow query log is enabled. Current long_query_time = 2.000000 sec. You have 92 out of 279119812 that take longer than 2.000000 sec. to complete Your long_query_time seems to be fine BINARY UPDATE LOG The binary update log is NOT enabled. You will not be able to do point in time recovery See http://dev.mysql.com/doc/refman/5.5/en/point-in-time-recovery.html WORKER THREADS Current thread_cache_size = 256 Current threads_cached = 196 Current threads_per_sec = 0 Historic threads_per_sec = 0 Your thread_cache_size is fine MAX CONNECTIONS Current max_connections = 400 Current threads_connected = 62 Historic max_used_connections = 289 The number of used connections is 72% of the configured maximum. Your max_connections variable seems to be fine. INNODB STATUS Current InnoDB index space = 17 M Current InnoDB data space = 55 M Current InnoDB buffer pool free = 18 % Current innodb_buffer_pool_size = 512 M Depending on how much space your innodb indexes take up it may be safe to increase this value to up to 2 / 3 of total system memory MEMORY USAGE Max Memory Ever Allocated : 10.59 G Configured Max Per-thread Buffers : 12.57 G Configured Max Global Buffers : 1.51 G Configured Max Memory Limit : 14.08 G Physical Memory : 23.06 G Max memory limit seem to be within acceptable norms KEY BUFFER Current MyISAM index space = 16 M Current key_buffer_size = 512 M Key cache miss rate is 1 : 3464 Key buffer free ratio = 81 % Your key_buffer_size seems to be fine QUERY CACHE Query cache is enabled Current query_cache_size = 512 M Current query_cache_used = 786 K Current query_cache_limit = 4 M Current Query cache Memory fill ratio = .14 % Current query_cache_min_res_unit = 4 K Your query_cache_size seems to be too high. Perhaps you can use these resources elsewhere MySQL won't cache query results that are larger than query_cache_limit in size SORT OPERATIONS Current sort_buffer_size = 8 M Current read_rnd_buffer_size = 8 M Sort buffer seems to be fine JOINS Current join_buffer_size = 8.00 M You have had 0 queries where a join could not use an index properly Your joins seem to be using indexes properly join_buffer_size >= 4 M This is not advised OPEN FILES LIMIT Current open_files_limit = 4506 files The open_files_limit should typically be set to at least 2x-3x that of table_cache if you have heavy MyISAM usage. Your open_files_limit value seems to be fine TABLE CACHE Current table_open_cache = 2048 tables Current table_definition_cache = 400 tables You have a total of 142 tables You have 364 open tables. The table_cache value seems to be fine TEMP TABLES Current max_heap_table_size = 512 M Current tmp_table_size = 512 M Of 952993 temp tables, 19% were created on disk Created disk tmp tables ratio seems fine TABLE SCANS Current read_buffer_size = 8 M Current table scan ratio = 9 : 1 read_buffer_size seems to be fine TABLE LOCKING Current Lock Wait ratio = 1 : 5029903 Your table locking seems to be fine
不是configuration问题，
Mysql使用cpu的120％也许有些慢查询。
高php的使用，也许一些脚本或插件。
尝试cachingwordpres和禁用插件。
尝试安装apc或xcache和memcached（w3tc或flexicache也许帮助他们工作很好惠特memcached）
看来，你有太多的要求。 caching任何你可以。
这可能是一个DDoS攻击。 查看端口80上的连接统计信息，以及是否有某种模式阻止冒犯性IP。